ReleaseNotes: tidy up
ReleaseNotes: tidy up

git-svn-id: 9c40c3d70ca22355f6c7d44e2c973a96cb75cedf@326190 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang